Which Major Islands and Minerals of the World term is correctly associated with important identifying fact: “mainly manganese dioxide, MnO2”, and also with “an important ore of manganese”?

Correct Answer: Option D — Pyrolusite. Pyrolusite is correct because it is mainly manganese dioxide, MnO2. Pyrolusite is also associated with an important ore of manganese. A further identifying fact is that Pyrolusite is mainly manganese dioxide, MnO2. Another useful fact is that Pyrolusite is associated with an important ore of manganese. Why the other options are incorrect: Option A — Gypsum: It is used in plaster and cement manufacture and is associated with a hydrated calcium sulphate mineral; those are the identifying facts of Gypsum. Option B — Mica: It is valued as an electrical and thermal insulator and is associated with a sheet silicate mineral group; those are the identifying facts of Mica. Option C — Greenland: It is the world's largest island that is not a continent and is associated with located between the Arctic and North Atlantic oceans; those are the identifying facts of Greenland. Exam Takeaway: Link Pyrolusite with “mainly manganese dioxide, MnO2” and “an important ore of manganese” for quick revision.